Implement support for `--exclude <req>`. (#2281) #2296

Job	Run time
Check GitHub Organization	1s
tox -e format-check,typecheck,vendor-check,package	5m 20s
tox -e py312-pip23_3_1	26m 9s
./dtox.sh -e py27-pip20	12m 13s
tox -e py312-pip23_3_1-integration	40m 34s
./dtox.sh -e py35-pip20	16m 47s
./dtox.sh -e py311-pip20	19m 57s
./dtox.sh -e py311-pip22_3_1	15m 17s
./dtox.sh -e py311-pip23_1_2	23m 59s
./dtox.sh -e py312-pip23_3_1	21m 29s
./dtox.sh -e pypy310-pip20	27m 29s
./dtox.sh -e pypy310-pip22_3_1	43m 12s
./dtox.sh -e pypy310-pip23_1_2	27m 13s
./dtox.sh -e py27-pip20-integration	19m 10s
./dtox.sh -e py37-pip22_3_1-integration	1h 53m 4s
./dtox.sh -e py37-pip23_1_2-integration	1h 49m 48s
./dtox.sh -e py311-pip20-integration	25m 9s
./dtox.sh -e py311-pip22_3_1-integration	29m 54s
./dtox.sh -e py311-pip23_1_2-integration	29m 31s
./dtox.sh -e py312-pip23_3_1-integration	1h 1m 53s
./dtox.sh -e pypy310-pip20-integration	1h 16m 46s
./dtox.sh -e pypy310-pip22_3_1-integration	56m 42s
./dtox.sh -e pypy310-pip23_1_2-integration	55m 51s
Gather Final Status	1s
	14h 17m 29s

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